By subjecting the body to strain through muscle training and then applying stimulation from intense thrusts, pleasure is induced. This process refines not only muscles but also the uterus and the beauty of women themselves. Maintain your position, tighten your vagina, and don't give in to pleasure! Even if you're about to climax, endure it! Defeat yourself!! 'I'm... I'm feeling ecstasy, I think I'm going crazy…'
